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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Five-ball fatigue tester makes possible the study of rolling element phenomena. The device consists of a driven test ball pyramided upon four lower balls positioned by a separator and free to rotate in an angular contact raceway.
Early detection method locates damage or small defects in rolling element bearings of critical machine components. This detection method operates on the principle that an impact is generated each time a defect in an otherwise smooth surface is in intimate moving contact with another smooth surface.
Plastic deformation during cold rolling of high strength titanium alloy strips
Space environment effect on lubricants and rolling element bearings
Rolling stability derivatives of variable sweep tactical fighter aircraft model at subsonic and transonic speeds
Physical characteristics of rolling stone and surrounding lunar surface based on Lunar Orbiter II photographic analysis
Rolling-element bearings design and material processing for special conditions, noting stress and fatigue
Incompressible fluid drag force on sphere rolling at constant speed in closed-end tube
Roll diffusion bonding technique is used for fabricating T-stiffened panel assemblies from titanium alloy. The single unit fabrication exhibits excellent strength characteristics under tensile and compressive loads. This program is applied to structures in which weight/strength ratio and integral construction are important considerations.
Thirty watt per pound roll-up solar array feasibility
Inflight and ground simulation measurements of pilot transfer characteristics in compensatory roll tracking task
Lubrication of sliding and rolling element electric contacts in vacuum
Design criteria for five element folding arm used in roll-up solar arrays
Subsurface residual stress on steel inner races from ball bearings during rolling contact
Feasibility of 30 watts per pound roll-up solar array - design of engineering demonstration model with deployability of selected flight configuration and thermal cycling tests of array
Summary data on deposition and endurance lives of thin metallic films used for lubricating sliding and rolling element electrical contacts in vacuum environments
Vehicle instrumention and ground support equipment development to improve vertical and roll alignment of Scout launch vehicle
Roll and attitude stability for gravity gradient satellites